<template>
  <div style="height: 90%;width: 100%">
    <div class="login">
      <el-row>
        <el-col :xs="24" :sm="12">
          <div class="login-left">
            <h3>后台管理系统</h3>
          </div>
        </el-col>
        <el-col :xs="24" :sm="12">
          <el-form ref="loginForm" :model="loginForm" :rules="loginRules" class="login-form login-width login-right">
            <h3 class="title">密码登录</h3>
            <el-form-item prop="username">
              <el-input
                v-model="loginForm.username"
                type="text"
                auto-complete="off"
                placeholder="账号"
                name="username"
              >
                <svg-icon slot="prefix" icon-class="user" class="el-input__icon input-icon"/>
              </el-input>
            </el-form-item>
            <el-form-item prop="password">
              <el-input
                v-model="loginForm.password"
                type="password"
                auto-complete="off"
                placeholder="密码"
                name="password"
                @keyup.enter.native="handleLogin"
              >
                <svg-icon slot="prefix" icon-class="password" class="el-input__icon input-icon"/>
              </el-input>
            </el-form-item>
            <el-form-item prop="code" v-if="captchaEnabled">
              <el-input
                v-model="loginForm.code"
                auto-complete="off"
                placeholder="验证码"
                style="width: 63%"
                name="code"
                @keyup.enter.native="handleLogin"
              >
                <svg-icon v-slot="prefix" icon-class="validCode" class="el-input__icon input-icon"/>
              </el-input>
              <div class="login-code">
                <img :src="codeUrl" @click="getCode" class="login-code-img" alt=""/>
              </div>
            </el-form-item>
            <el-checkbox v-model="loginForm.rememberMe" style="margin:0 0 25px 0;">记住密码</el-checkbox>
            <el-form-item style="width:100%;">
              <el-button
                :loading="loading"
                size="medium"
                type="primary"
                style="width:100%;"
                ref="login"
                @mousemove.native="loginCheck"
                @click.native.prevent="handleLogin"
              >
                <span v-if="!loading">登 录</span>
                <span v-else>登 录 中...</span>
              </el-button>
              <div style="float: right;" v-if="register">
                <router-link class="link-type" :to="'/register'">立即注册</router-link>
              </div>
            </el-form-item>
          </el-form>
        </el-col>
      </el-row>
      <!--  底部  -->
      <div class="el-login-footer">
        <span>Copyright © 2018-{{ currentYear }} xx.vip All Rights Reserved.</span>
      </div>
    </div>
  </div>
</template>

<script>
import {getCodeImg} from "@/api/login";
import Cookies from "js-cookie";
import {encrypt, decrypt} from '@/utils/jsencrypt'

export default {
  name: "Login",
  data() {
    return {
      codeUrl: "",
      currentYear: new Date().getFullYear(),
      loginForm: {
        username: "",
        password: "",
        rememberMe: false,
        code: "",
        uuid: ""
      },
      loginRules: {
        username: [
          {required: true, trigger: "blur", message: "请输入您的账号"}
        ],
        password: [
          {required: true, trigger: "blur", message: "请输入您的密码"}
        ],
        code: [{required: true, trigger: "change", message: "请输入验证码"}]
      },
      loading: false,
      // 验证码开关
      captchaEnabled: false,
      // 注册开关
      register: false,
      redirect: undefined,
    };
  },
  watch: {
    $route: {
      handler: function (route) {
        this.redirect = route.query && route.query.redirect;
      },
      immediate: true
    }
  },
  created() {
    this.getCode();
    this.getCookie();
  },
  mounted() {
    this.button = this.$refs.login.$el;
  },
  methods: {
    distanceBetween(p1x, p1y, p2x, p2y) {
      const dx = p1x - p2x;
      const dy = p1y - p2y;
      return Math.sqrt(dx * dx + dy * dy);
    },
    loginCheck(event) {
      if (document.querySelector('input[name="password"]').value &&
        document.querySelector('input[name="username"]').value) {
        return;
      }
      const button = this.$refs.login.$el;
      const radius = Math.max(button.offsetWidth * 1.75, button.offsetHeight * 1.75, 180);
      const bx = button.parentNode.offsetLeft + button.offsetLeft + button.offsetWidth / 2;
      const by = button.parentNode.offsetTop + button.offsetTop + button.offsetHeight / 2;
      const dist = this.distanceBetween(event.clientX, event.clientY, bx, by)
      const angle = Math.atan2(event.clientY - by, event.clientX - bx);
      const ox = -1 * Math.cos(angle) * Math.max((radius - dist), 0);
      const oy = -1 * Math.sin(angle) * Math.max((radius - dist), 0);
      console.log(ox,oy)
      const rx = oy / 2;
      const ry = -ox / 2;
      button.style.transition = 'all 0.1s ease';
      // rotateX(${rx}deg)  rotateY(${ry}deg)
      button.style.transform = `translate(${ox}px,${oy}px) `;
      button.style.boxShadow = `θpx ${Math.abs(oy)}px ${Math.abs(oy) / radius * 48}px rgba(e,0,0,0.15)`;

    },
    getCode() {
      getCodeImg().then(res => {
        this.captchaEnabled = res.data.captchaEnabled === undefined ? true : res.data.captchaEnabled;
        if (this.captchaEnabled) {
          this.codeUrl = "data:image/gif;base64," + res.data.img;
          this.loginForm.uuid = res.data.uuid;
        }
      });
    },
    getCookie() {
      const username = Cookies.get("username");
      const password = Cookies.get("password");
      const rememberMe = Cookies.get('rememberMe')
      this.loginForm = {
        username: username === undefined ? this.loginForm.username : username,
        password: password === undefined ? this.loginForm.password : decrypt(password),
        rememberMe: rememberMe === undefined ? false : Boolean(rememberMe)
      };
    },
    handleLogin() {
      this.$refs.loginForm.validate(valid => {
        if (valid) {
          this.loading = true;
          if (this.loginForm.rememberMe) {
            Cookies.set("username", this.loginForm.username, {expires: 30});
            Cookies.set("password", encrypt(this.loginForm.password), {expires: 30});
            Cookies.set('rememberMe', this.loginForm.rememberMe, {expires: 30});
          } else {
            Cookies.remove("username");
            Cookies.remove("password");
            Cookies.remove('rememberMe');
          }
          this.$store.dispatch("Login", this.loginForm).then(() => {
            this.$router.push({path: this.redirect || "/"}).catch(() => {
            });
          }).catch(() => {
            this.loading = false;
            if (this.captchaEnabled) {
              this.getCode();
            }
          });
        }
      });
    }
  }
};
</script>

<style rel="stylesheet/scss" lang="scss">
.login {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100%;
  background-size: cover;

}

.login-left {
  border: 1px #EBEEF5 solid;
  border-right: none;
  background-color: #409EFF;
  height: 350px;
  justify-content: center;
  align-items: center;
  text-align: center;
  display: flex;
  color: #FFFFFF;
}

.login-right {
  border: 1px #EBEEF5 solid;
  border-left: none;
  background-color: #FFFFFF;
  height: 350px;
}

.title {
  text-align: center;
  color: #303133;
}

@media screen and (max-width: 768px) {
  .login-width {
    width: 100% !important;
    max-width: 100%;
  }
  .login-left {
    border: 1px #EBEEF5 solid;
    border-right: none;
    background-color: #409EFF;
    height: 150px;
    justify-content: center;
    align-items: center;
    text-align: center;
    display: flex;
    color: #FFFFFF;
  }
}

.login-form {
  padding: 10px;

  .el-input {
    height: 38px;

    input {
      height: 38px;
    }
  }

  .input-icon {
    height: 39px;
    width: 14px;
    margin-left: 2px;
  }
}

.login-width {
  width: 450px;
  max-width: 100%;
}

.login-tip {
  font-size: 13px;
  text-align: center;
  color: #bfbfbf;
}

.login-code {
  width: 33%;
  height: 38px;
  float: right;

  img {
    cursor: pointer;
    vertical-align: middle;
  }
}

.el-login-footer {
  height: 40px;
  line-height: 40px;
  position: fixed;
  bottom: 0;
  width: 100%;
  text-align: center;
  font-family: Arial, serif;
  font-size: 12px;
  letter-spacing: 1px;
}

.login-code-img {
  height: 38px;
}
</style>
